Stabilizer combination

Abstract

A description is given of novel stabilizer mixtures comprising at least one compound of the formula ##STR1## and at least one compound of the formula ##STR2## in which the variables are as defined in the claims. The novel stabilizer mixtures are suitable for stabilizing organic material, especially textile fibre materials, against damage by light, oxygen and heat.

What is claimed is: 
     
       1. A stabilizer mixture comprising at least one compound of the formula ##STR24## and at least one compund of the formula ##STR25## in which R 1  and R 1  ' independently of one another are each linear or branched C 1  -C 18  alkyl, C 3  -C 8  cycloalkyl, C 3  -C 6  alkenyl, unsubstituted or C 1  -C 4  alkyl-, C 1  -C 4  alkoxy- or halo-substituted biphenyl, unsubstituted or C 1  -C 4  alkyl-, C 1  -C 4  alkoxy- or halo-substituted naphthyl, unsubstituted or C 1  -C 4  alkyl-, C 1  -C 4  alkoxy- or halo-substituted phenyl or C 7  -C 12  aralkyl, R 2 , R 2  ', R 3 , R 3  ', R 4  and R 5  independently of one another are each hydrogen, unsubstituted or halo-, cyano-, hydroxyl-, amino-, C 1  -C 4  alkoxycarbonyl-, carbamoyl, N-mono- or N,N-di-C 1  -C 4  alkyl carbamoyl-, glycidyl or phenyl-substituted linear or branched C 1  -C 12  alkyl, or linear or branched C 4  -C 28  alkyl, which is interrupted by one or more N, S or O atoms and which is unsubstituted or substituted by hydroxyl or by a radical --OR 6  or are a radical --CO--R 6  or --SO 2  --R 6 , and R 6  is C 1  -C 12  alkyl, unsubstituted or C 1  -C 4  alkyl-substituted phenyl or C 7  -C 12  aralkyl. 
     
     
       2. A stabilizer mixture according to claim 1, wherein R 1  and R 1  ' independently of one another are each C 1  -C 6  alkyl, cyclohexyl which is unsubstituted or substituted by 1-3 methyl groups, allyl, isopropenyl, unsubstituted or C 1  -C 4  alkyl-, C 1  -C 4  alkoxy or halo-substituted phenyl, benzyl or α-methylbenzyl. 
     
     
       3. A stabilizer mixture according to claim 1, wherein R 1  and R 1  ' are identical and are each C 1  -C 4  alkyl, cyclohexyl, allyl, phenyl or benzyl. 
     
     
       4. A stabilizer mixture according to claim 1, wherein R 1  and R 1  ' are identical and are each methyl. 
     
     
       5. A stabilizer mixture according to claim 1, wherein R 2 , R 2  ', R 3 , R 3  ', R 4  and R 5  independently of one another are each hydrogen, C 1  -C 6  alkyl or straight-chain or branched C 4  -C 28  alkyl which is interrupted by one or more groups --O-- and is substituted by hydroxyl or by a radical --OR 6 , in which R 6  is C 1  -C 4  alkyl, phenyl, o-, m- or p-tolyl or benzyl, or are u nsubstituted or C 1  -C 4  alkyl-substituted benzoyl or phenylsulfonyl. 
     
     
       6. A stabilizer mixture according to claim 1, wherein R 2 , R 2  ', R 3 , R 3  ', R 4  and R 5  independently of one another are each hydrogen, C 1  -C 4  alkyl, a radical of the formula --(CH 2  CHR 7  --O) n  --H, in which R 7  is methyl or hydrogen and n is an integer from 1 to 9, or are benzoyl. 
     
     
       7. A stabilizer mixture according to claim 1, wherein R 2 , R 2  ' and R 5  independently of one another are each C 1  -C 4  alkyl, a radical of the formula --(CH 2  CHR 7  --O) n  --H, in which R 7  is methyl or hydrogen and n is an integer from 1 to 9, or are benzoyl, R 3  is hydrogen, C 1  -C 4  alkyl, a radical of the formula --(CH 2  CHR 7  --O) n  --H, in which R 7  is methyl or hydrogen and n is an integer from 1 to 9, or is benzoyl, and R 3  ' and R 4  are each hydrogen. 
     
     
       8. A stabilizer mixture according to claim 1 wherein R 2 , R 2  ' and R 5  are identical and are each C 1  -C 4  alkyl, R 3  is hydrogen or C 1  -C 4  alkyl and R 3  ' and R 4  are each hydrogen. 
     
     
       9. A stabilizer mixture according to claim 1 comprising essentially the compounds of the formula ##STR26## in which R 1  is linear or branched C 1  -C 18  alkyl, C 3  -C 8  cycloalkyl, C 3  -C 6  alkenyl, unsubstituted or substituted aryl or C 7  -C 12  aralkyl, and R 2  is hydrogen, unsubstituted or substituted linear or branched C 1  -C 12  alkyl, or linear or branched C 4  -C 28  alkyl which is interrupted by one or more N, S or O atoms and which may be substituted further or are a radical --CO--R 6  or --SO 2  --R 6 , and R 6  is C 1  -C 12  alkyl, unsubstituted or C.sub. -C 4  alkyl-substituted phenyl or C 7  -C 12  aralkyl. 
     
     
       10. A stabilizer mixture according to claim 9, comprising from 50 to 95% by weight of compounds of the formulae (1a) and (1b) and from 50 to 5% by weight of the compound of the formula (2a). 
     
     
       11. A stabilizer mixture according to claim 9, comprising from 50 to 80% by weight of compounds of the formulae (1a) and (1b) and from 50 to 20% by weight of the compound of the formula (2a), in which R 1  C 1  -C 4  alkyl, cyclohexyl, allyl, phenyl or benzyl and R 2  is C 1  -C 4  alkyl, a radical of the formula --(CH 2  CHR 4  --O) n  --H, in which R 4  is methyl or hydrogen and n is an integer from 1 to 9, or are benzoyl.